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T Cell Activation and Clonal Selection

T Cell Activation and Clonal Selection

T cells are integral to our adaptive immune system, recognizing and effectively responding to foreign antigens. T cell activation and clonal selection are pivotal in orchestrating this immune response. This article elucidates these mechanisms, detailing the roles of cluster of differentiation (CD) markers, major histocompatibility complex (MHC) molecules, costimulatory signals, and the process of clonal selection.
Naive T cells that have not yet encountered an antigen express two primary CD...

Diversity of Antigen Receptors

Diversity of Antigen Receptors

Antigen receptors are essential components of the immune system crucial in defending the body against foreign invaders. These receptors are present on the surface of B and T cells, enabling them to recognize antigens and mount an appropriate immune response.
Before encountering any antigen, lymphocytes express these receptors. On B cells, the antigen receptor is a membrane-bound antibody molecule called BCR; on T cells, it is a T cell receptor or TCR. B and T cell receptors are composed of two...

T Cell Types and Functions

T Cell Types and Functions

When T cells with CD4 markers are activated, they give rise to two types of effector cells: helper T cells and regulatory T cells. Meanwhile, T cells with CD8 markers differentiate into effector cytotoxic T cells. The differentiation of CD4 T cells into helper T cell subsets, such as Th1, Th2, and Th17 cells, is dependent on the antigen type, antigen-presenting cell, and regulatory cytokines.
Th1 cells stimulate dendritic cells to express necessary co-stimulatory molecules on their surfaces for...

Cytotoxic T Cells-mediated Immune Response

Cytotoxic T Cells-mediated Immune Response

Cytotoxic T cells are a vital component of the immune system. They have the remarkable ability to identify and target antigens on infected or abnormal cells. These antigens often originate from intracellular pathogens such as viruses or abnormal proteins cancer cells produce.
Immunological surveillance is the ability of immune cells to monitor and eliminate infected cells with intracellular pathogens, neoplastically transformed cells, and cells with non-self antigens. Cytotoxic T cells and NK...

TGF - β Signaling Pathway

TGF - β Signaling Pathway

The TGF-β signaling pathway regulates cell growth, differentiation, adhesion, motility, and development. TGF-β ligands that induce TGF-β signaling are synthesized in their latent form. Several proteases or cell surface receptors such as integrins act upon the latent form, releasing the active ligand. There are three types of mammalian TGF-βs: (TGF-β1, TGF-β2, and TGF-β3) that bind as homodimers or heterodimers to TGF-β receptors. The TGF-β receptors are of three kinds RI, RII, and RIII. The RI...

G Protein-coupled Receptors

G Protein-coupled Receptors

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Related Experiment Video

Updated: Jul 19, 2026

Expansion of Human Peripheral Blood γδ T Cells using Zoledronate

Expansion of Human Peripheral Blood γδ T Cells using Zoledronate

Published on: September 9, 2011

Gamma delta T cell receptors.

Y-h Chien¹, M Bonneville

¹The Department of Microbiology and Immunology, and the Program in Immunology, Stanford University, Beckman B255, 279 Campus Drive, Stanford, California 94305, USA. chien@stanford.edu

Cellular and Molecular Life Sciences : CMLS

|September 28, 2006

Summary

Gamma delta T cells are poorly understood immune cells. Recent advances clarify the antigens targeted by their receptors, aiding in understanding their immune functions.

Area of Science:

Immunology
Cellular Biology

Background:

Gamma delta (γδ) T cells represent a distinct subset of T lymphocytes.
Their precise roles in immunity and disease remain largely undefined due to challenges in identifying their specific antigen targets.

Purpose of the Study:

To review recent breakthroughs in identifying antigens recognized by the gamma delta T cell receptor (γδ TCR).
To discuss the implications of these findings for understanding γδ T cell biology and pathology.

Main Methods:

Literature review of recent studies on gamma delta T cell immunology.
Analysis of findings related to gamma delta T cell receptor specificity.

Main Results:

Significant progress has been made in characterizing the antigen-binding capabilities of the γδ TCR repertoire.

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Expansion and Enrichment of Gamma-Delta (γδ) T Cells from Apheresed Human Product

Expansion and Enrichment of Gamma-Delta (γδ) T Cells from Apheresed Human Product

Published on: September 22, 2021

Generating De Novo Antigen-specific Human T Cell Receptors by Retroviral Transduction of Centric Hemichain

Generating De Novo Antigen-specific Human T Cell Receptors by Retroviral Transduction of Centric Hemichain

Published on: October 25, 2016

Related Experiment Videos

Last Updated: Jul 19, 2026

Expansion of Human Peripheral Blood γδ T Cells using Zoledronate

Expansion of Human Peripheral Blood γδ T Cells using Zoledronate

Published on: September 9, 2011

Expansion and Enrichment of Gamma-Delta (γδ) T Cells from Apheresed Human Product

Expansion and Enrichment of Gamma-Delta (γδ) T Cells from Apheresed Human Product

Published on: September 22, 2021

Generating De Novo Antigen-specific Human T Cell Receptors by Retroviral Transduction of Centric Hemichain

Generating De Novo Antigen-specific Human T Cell Receptors by Retroviral Transduction of Centric Hemichain

Published on: October 25, 2016

New insights are emerging regarding the specific molecular targets of γδ T cells.

Conclusions:

Understanding γδ T cell antigen recognition is crucial for elucidating their functions.
Recent advances provide a foundation for further investigation into the role of γδ T cells in health and disease.